godoc: fix error with gcsBaseURL not being defined
godoc: fix error with gcsBaseURL not being defined

Change-Id: I508209c3bad67b791ee8c162bd4df448f9b84bef
Reviewed-on: https://go-review.googlesource.com/68270
Reviewed-by: Chris Broadfoot <0c2851a4f8ab4aa5606e69c0757771dd13dbe686@golang.org>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools